So finally got the camera so can report that aperture works with the EF-M2 adapter from f1.2 to f11 (sigma 18-35), but only on firmware version 3.0. Out of the box for me no (qc 5.5.2018) or with the latest 3.2 no.

The speed booster is a bit loose against the BMPCCK4K, I would say it’s about normal amount of movement.

With sigma 18-35 it’s a bit bit too tight, so tight that the lense mount scrapes plastic from inside the adapter, there’s small leaf springs pushing the lense against the adapter. The aperture control is quite noisy, so if using the automatic exposure microphone needs to be far away... haven’t yet testes if low cut filters will help. Balance point with just camera with battery, adapter and lense with hood is about 2cm forward from the adapter.

Manually adjusting the sigmas zoom or focus doesn’t move the adapter. The adapters mounting point would need the be somewhat higher to be at level with the camera.

Today I got email reply from @jyk-hk that they are now “studying compatibility with the BMPCC4K 4K”. Much more promising reply than the previous one “no detailed schedule”. So perhaps firmware for viltrox ef-m2 that supports the pocket cinema camera 4K will happen sooner than later.

Now that the camera got firmware update to 6.1, the previously working firmware 3.0 on the adapter stopped responding to iris changes. The adapter reports the iris value but can't change it and then looses the connection. With the 2.3 firmware for the adapter, oldest on the viltrox web page, the iris changing works.... still waiting for the new firmware from viltrox that supports focus and is + now an iris control fix.

Last edited by Cooper on Thu Feb 07, 2019 2:29 pm, edited 1 time in total.

For the record, I just picked up a Mitakon Zhongyi Nikon F Mount G Lens to Micro Four Thirds adapter (a steal – brand new at $59 on eBay, instead of $150 at B&H) and I’m blown away by how well it fits and works.

This unit has no electronic functionality at all, but it more than meets my needs – using my old manual Nikon glass with the BMPCC4K.

I’m just mentioning it as a viable option, among the other choices out there for speed boosters. I’m surprised and happy with the optical performance.

Randy Walters wrote:For the record, I just picked up a Mitakon Zhongyi Nikon F Mount G Lens to Micro Four Thirds adapter (a steal – brand new at $59 on eBay, instead of $150 at B&H) and I’m blown away by how well it fits and works.

This unit has no electronic functionality at all, but it more than meets my needs – using my old manual Nikon glass with the BMPCC4K.

I’m just mentioning it as a viable option, among the other choices out there for speed boosters. I’m surprised and happy with the optical performance.

In regards to the Mitakon Zhongyi Nikon F Mount G Lens -

Is there any cropping from the fact that is is Micro 4/3rds on the Pocket 4Ks sensor?

Is there any cropping from the fact that is is Micro 4/3rds on the Pocket 4Ks sensor?

James, I’m not clear on exactly what you’re asking.

Here’s a sample; this is a full-frame micro-NIKKOR 55mm f/2.8 lens, which on a bare BMPCC 4K would give a field of view equivalent to 110mm.

Using the Mitakon Zhongyi, that ratio changes by .726, giving the equivalent of an 80mm f/2. We’re still not getting the entire content of the original full-frame circle, but we’re seeing significantly more than we would without the adapter.

Since the adapter was designed for a MFT sensor size, it should match up appropriately with the BMPCC 4K, if that’s what you’re asking. I hope that helps …

James, full-frame photo lenses will not vignette with a .7x focal reducer in theory but good for Randy including the pic that illustrates everything is going “according to plan” and no funny behavior due to the BMPCC4K exceeding the normal mMT sensor size horizontally.

Sent from my iPhone using Tapatalk

Last edited by rick.lang on Fri Feb 08, 2019 12:52 am, edited 1 time in total.

Does anyone know if there is a problem updating (or in this case, downgrading) this speedbooster on a mac? Tried a couple of cables/ports and can't get it to mount on my Macbook so that I can change the firmware.

(It's not entirely clear from their instructions but I gather I should just be able to plug it in with USB and it should show up as a drive?)

Cooper wrote:Now that the camera got firmware update to 6.1, the previously working firmware 3.0 on the adapter stopped responding to iris changes. The adapter reports the iris value but can't change it and then looses the connection. With the 2.3 firmware for the adapter, oldest on the viltrox web page, the iris changing works.... still waiting for the new firmware from viltrox that supports focus and is + now an iris control fix.

Ah! Thanks so much much for this info! I bought the Viltrox adaptor months before my camera arrived. And... had no iris control on Camera firmware 6.1 or 6.2 with the Viltrox as shipped. Updated the Viltrox to latest firmware v3.2 and no change. Thought it might be faulty.But after downgrading to Viltrox v2.3 I now have iris control Happy days!

For anyone searching this solution, Viltrox made available a new version of Firmware - 3.3It adds a fix for BMPCC 4K. Just tested and iris control works fine with my BMPCC4K (latest firmware) and Sigma 18-35.

olix4242 wrote:For anyone searching this solution, Viltrox made available a new version of Firmware - 3.3It adds a fix for BMPCC 4K. Just tested and iris control works fine with my BMPCC4K (latest firmware) and Sigma 18-35.

I bought ef-m1 and ef-m2 - both dont working iris(((firmawares tried 2.3, 3.0 and 3.3viltrox said:"info@jyc-hk.comDear Customer, The model number you got is the EF-M2, right? If yes, it can not work with this camera. You need to change it to the EF-M2 II. Thanks! Best Regar"

olix4242 wrote:For anyone searching this solution, Viltrox made available a new version of Firmware - 3.3It adds a fix for BMPCC 4K. Just tested and iris control works fine with my BMPCC4K (latest firmware) and Sigma 18-35.

I bought ef-m1 and ef-m2 - both dont working iris(((firmawares tried 2.3, 3.0 and 3.3viltrox said:"info@jyc-hk.comDear Customer, The model number you got is the EF-M2, right? If yes, it can not work with this camera. You need to change it to the EF-M2 II. Thanks! Best Regar"

Might has missed it but are you sure the lens you are using is supported with the EF-2? I'm using with several Canon EF lenses and all have iris control. (but no auto focus).

olix4242 wrote:For anyone searching this solution, Viltrox made available a new version of Firmware - 3.3It adds a fix for BMPCC 4K. Just tested and iris control works fine with my BMPCC4K (latest firmware) and Sigma 18-35.

I bought ef-m1 and ef-m2 - both dont working iris(((firmawares tried 2.3, 3.0 and 3.3viltrox said:"info@jyc-hk.comDear Customer, The model number you got is the EF-M2, right? If yes, it can not work with this camera. You need to change it to the EF-M2 II. Thanks! Best Regar"

Might has missed it but are you sure the lens you are using is supported with the EF-2? I'm using with several Canon EF lenses and all have iris control. (but no auto focus).

Some non Canon EF lenses dont have reliable Iris control with the EF-M2. I have 2 Tamron and a Tokina zoom and all 3 have erratic, unreliable iris control, regardless of the EF-M2 firmware version. I'm hoping for some reports on the EF-M2 II to see if this would be any better.

olix4242 wrote:For anyone searching this solution, Viltrox made available a new version of Firmware - 3.3It adds a fix for BMPCC 4K. Just tested and iris control works fine with my BMPCC4K (latest firmware) and Sigma 18-35.

I bought ef-m1 and ef-m2 - both dont working iris(((firmawares tried 2.3, 3.0 and 3.3viltrox said:"info@jyc-hk.comDear Customer, The model number you got is the EF-M2, right? If yes, it can not work with this camera. You need to change it to the EF-M2 II. Thanks! Best Regar"

Might has missed it but are you sure the lens you are using is supported with the EF-2? I'm using with several Canon EF lenses and all have iris control. (but no auto focus).

I've tried it with the Tokina 11-20 and Sigma 50-100 and autofocus doesn't work. I never use any settings on auto so it's really not a concern for me but I might see how it would be for some. BM cameras have never had good enough autofocus to use in a real world situation IMO. Most of my glass is manual anyways.

I have a BMPCC4K and a few Nikon AF-S lenses... New ti the MFT realm and looking for a Speed Booster WITH pass through electronics so I can auto focus and set aperture from the camera (I am severely sight impaired and find manual focus to be a tiresome)...

I see Viltrox have a number of these for Canon lenses but haven't found any for the Nikon G lenses...